Can't run snaps on Ubuntu 18.04

[vasilisc]

***

NOTE: if you are affected, look at the workaround here: https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1756793/comments/23

***

when trying to run a snap I get the error

execl failed: No such file or directory
child exited with status 1

snapd 2.32+18.04~pre4
snapd-login-service 1.32-1
snapd-xdg-open 2.32+18.04~pre4
kernel linux-image-4.15.0-13-generic

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: snapd 2.32+18.04~pre4
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
Date: Mon Mar 19 08:09:10 2018
InstallationDate: Installed on 2014-04-21 (1427 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
SourcePackage: snapd
UpgradeStatus: No upgrade log present (probably fresh install)

[Dan Watkins (oddbloke)]

I'm seeing this with the Spotify snap using snapd 2.32+18.04~pre5 on bionic; the Slack snap launches fine.

[Sergio Schvezov (sergiusens)]

If slack works and spotify fails, it might be a confinement issue

[Oliver Grawert (ogra)]

sounds like "classic confinement" vs. "properly confined" to me

[Dan Watkins (oddbloke)]

$ snap info
snap 2.32+18.04~pre5
snapd 2.32+18.04~pre5
series 16
ubuntu 18.04
kernel 4.15.0-12-generic

$ snap run --strace spotify
error: exit status 1

[Zygmunt Krynicki (zyga)]

I cannot reproduce this on fully up-to-date bionic along with a stable core snap.

My system was running:

zyga@t470:~$ snap version
snap unknown
snapd 2.31.2
series 16
ubuntu 18.04
kernel 4.15.0-12-generic

The core snap was at revision 4206 (from the stable channel).

[Owais Lone (loneowais)]

I'm seeing this with firefox on 18.04

```
> snap install firefox

> snap run firefox
execl failed: No such file or directory
child exited with status 1

> snap info firefox

name: firefox
summary: Mozilla Firefox web browser
publisher: mozilla
license: unknown
description: |
  The new Firefox
  Meet Firefox Quantum. Fast for good.

  Features:

    • A powerful, new engine that’s built for rapidfire performance.
    • Better, faster page loading that uses less computer memory.
    • Gorgeous design and smart features for intelligent browsing.

  Now 2x faster
  Crazy powerful browser engine? Check. Less time waiting around for pages to load? Also, check.
  Firefox Quantum is twice as fast as Firefox was before.

  Smooth browsing
  Whether you’ve opened 10 or 1000, switching between tabs is faster than ever with Firefox’s new,
  responsive engine.

  Seriously Private Browsing
  The most powerful private browsing mode with added tracking protection.

    • Private Browsing
  ◦ Firefox blocks online trackers while you browse and won’t remember your history after you’re
  done.

    • Tracking Protection
  ◦ Some ads have hidden trackers that follow you online. Rude. We know. That’s why our powerful
  tool stops them cold.

    • Faster Page Loading
  ◦ By blocking some ads and scripts that bog down browsing, pages load up to 44%!(NOVERB) faster. Now
  that’s a win-win.

  Customization Features

    • Extensions
  ◦ Customize Firefox with thousands of extensions like LastPass, uBlock Origin, Evernote and more.

    • Themes
  ◦ Make over Firefox to suit your mood! Choose a new look from our theme categories or create your
  own.

  Sync your devices
  • Seamlessly access passwords, bookmarks and more. Plus, use our Send Tabs feature to instantly
  share open tabs between desktop, mobile and tablet.

  Browse for good

  Firefox is made by Mozilla, the non-profit champions of a healthy internet. Mozilla also tackles
  issues like privacy, misinformation and trolling by investing in fellowships, campaigns and new
  technologies designed to make the internet healthier.
commands:
  - firefox
snap-id: 3wdHCAVyZEmYsCMFDE9qt92UV8rC8Wdk
tracking: stable
refreshed: 2018-03-16T10:00:17+05:30
installed: 59.0.1-1 (68) 193MB -
channels:
  stable: 59.0.1-1 (68) 193MB -
  candidate: 59.0-5 (66) 193MB -
  beta: 59.0b11-1 (57) 193MB -
  edge: 60.0b4-1 (69) 196MB -
```

[Emanuele (emanuc)]

Same problem for me, after an update of appearance and snap 2.32, I can not start many snap.

snap run firefox
execl failed: No such file or directory
child exited with status 1

snap run keepassxc
execl failed: No such file or directory
child exited with status 1

and almost any other snap, telegram works.

apt list snapd
Elencazione... Fatto
snapd/bionic,now 2.32+18.04~pre5 amd64 [installato]

apt list -a apparmor
Elencazione... Fatto
apparmor/bionic-proposed,now 2.12-3ubuntu1 amd64 [installato]
apparmor/bionic 2.11.0-2ubuntu19 amd64

Log: https://paste.ubuntu.com/p/9XsYf3Vvwf/

[Emanuele (emanuc)]

I do not know if they can be useful, but I place other logs that I found

https://pastebin.ubuntu.com/p/ZF2HdFq6DQ/

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Nathan Osman (george-edison55)]

I'm getting this error with other snaps as well:

  $ snap version
  snap 2.32+18.04~pre5
  snapd 2.32+18.04~pre5
  series 16
  ubuntu 18.04
  kernel 4.15.0-12-generic

  $ snap install brave
  brave v0.21.18dev from 'brave' installed

  $ snap run brave
  execl failed: No such file or directory
  child exited with status 1

[Alan Pope 🍺🐧🐱 🦄 (popey)]

I don't know if it's the same issue as I get a different error message.

But I too can't run some snaps on 18.04

alan@hal:~$ snap version
snap 2.32+18.04~pre5
snapd 2.32+18.04~pre5
series 16
ubuntu 18.04
kernel 4.15.0-12-generic

alan@hal:~$ which mumble
/snap/bin/mumble
alan@hal:~$ /snap/bin/mumble
internal error, please report: running "mumble" failed: cannot find installed snap "mumble" at revision 71

alan@hal:~$ discord
execl failed: No such file or directory
child exited with status 1

1 alan@hal:~$ chromium
internal error, please report: running "chromium" failed: cannot find installed snap "chromium" at revision 237

You get the idea.

[Julian Andres Klode (juliank)]

19681 execve("/usr/lib/snapd/snap-device-helper", ["/usr/lib/snapd/snap-device-helpe"..., "add", "snap_spotify_spotify", "/sys/class/mem/null", "1:3"], 0x7ffdeb9a73b8 /* 0 vars */) = -1 ENOENT (No such file or directory)
19681 write(2, "execl failed", 12) = 12
19681 write(2, ": No such file or directory\n", 28) = 28

[Julian Andres Klode (juliank)]

probably a different bug:

[ 2070.456928] audit: type=1400 audit(1521549044.438:182): apparmor="DENIED" operation="open" profile="snap.lxd.lxc" name="/proc/5304/attr/current" pid=5304 comm="cat" requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
[ 2070.457014] audit: type=1400 audit(1521549044.438:183): apparmor="DENIED" operation="exec" profile="snap.lxd.lxc" name="/usr/sbin/aa-exec" pid=5293 comm="lxc" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0

[Julian Andres Klode (juliank)]

Alan: Yours is really a different bug. A reboot fixes it or running the versioned postinst code in https://github.com/snapcore/snapd/blob/master/packaging/ubuntu-16.04/snapd.postinst#L15

[Julian Andres Klode (juliank)]

Well, the "cannot find" is. :D

[shemgp (shemgp)]

Thunderbird --beta doesn't work either and errors out like in the Firefox snap

[Joe Mooring (jmooring)]

sudo snap install spotify && snap run spotify --> "execl failed: No such file or directory"
sudo snap install brave && snap run brave --> "execl failed: No such file or directory"
sudo snap install mumble && snap run mumble --> Works as expected.

I hadn't noticed this before, perhaps it is normal: after removing a snap with `sudo snap remove foo` a "foo" directory still exists in ~/snaps.

[Frederik Feichtmeier (feichtmeier)]

Having the same issue with several apps like: spotify, skype, flare-rpg
Intellij and telegram-desktop work

[Gustavo Niemeyer (niemeyer)]

There are two recent issues in 18.04 that we're aware about. For one of them, the most trivial fix is to reboot the system. It's a problem in systemd ignoring a Condition on the snap.mount being inside a container and stopping the snap.mount unit, which chains into unmounting all snaps during the prerm which exists inside the previous deb.

Fixes for both of these problems are in the process of being rolled out.

We apologize for the trouble.

[Colin Ian King (colin-king)]

Do we have a QA process that can prevent this happening again?

[Zygmunt Krynicki (zyga)]

We have the fix for this issue and we will be working on making new package in proposed available ASAP

[Zygmunt Krynicki (zyga)]

NOTE: as a workaround you can do this:

snap refresh core --beta

This will fix your machine before an updated package is available.

[Gustavo Niemeyer (niemeyer)]

Hi Colin,

We discussed in the sprint two weeks ago how we could prevent this from happening again. Part of the problem here is that this only shows up in a multi-stage upgrade, because it's a misbehavior of systemd that was triggered on the prerm script.

So normal upgrade tests do not catch it. We need to test upgrading *out* of the given release instead. So install the *new* snapd, do changes to the system by installing snaps, reinstall the *new* snapd on top of the existing ones, and play with the system.

We'll look into implementing this.

That said, as usual regression tests catch regressions. They don't catch new and creative ways in which the system can break. So the true answer is that nothing can prevent this from happening again, unfortunately. We can just continue to work on making the risks ever smaller.

[steverweber (steve-r-weber)]

sudo snap refresh core --beta

resolved issue i was having with the skype snap not working on 18.04 beta

[flux (luigimarco)]

Sorry, but this bug affects me yet. With spotify, atom and vlc I have "snap-confine has elevated permissions and is not confined but should be. Refusing to continue to avoid permission escalation attacks". How can I resolve? Thanks
"

[Oliver Grawert (ogra)]

@flux:

your error message is completely different from what is discussed in this bug, you should better file a fresh bug (and make sure to always include the full output of "snap version" in your first report)

[Maitre Cake (maitre-cake)]

I have the same issue on Snap Notepad-plus-plus.
Only on restart (not on the installation instance).

Stopping apparmor solves the problem without being a proper solution.

[Zygmunt Krynicki (zyga)]

Hey, everyone affected. Could you please post the output of "snap version" as a comment.

[Maciej Borzecki (maciek-borzecki)]

Marking as Incomplete to let the issue expire if there is no activity. If the problem persist, feel free to post a comment.

[Maciej Borzecki (maciek-borzecki)]

Actually, the original problem was fixed and fix was released, so updating the status to reflect that.